MINERALS
Reaction to Hydrochloric Acid (HCl)
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Carbonate minerals such as calcite tend to fizz or efferves when tested with Hydrochloric Acid (HCl).
Non-carbonate minerals, especially silicates will not react to HCl.
Specimen
|
Characteristics
|
Chalk
|
|
|
Specimen does not cleave, it is fine grained, very soft, white in color, and it DOES react to HCl |
Kaolin
|
|
|
Specimen does not cleave, it is fine grained, very soft, white in color, and it DOES NOT react to HCl |
Calcite
|
|
|
Specimen does cleave, it is not fine grained, intermediate in softness, white in color, and it DOES react to HCl |
Feldspar
|
|
|
Specimen does cleave, it is not fine grained, very hard in softness, white in color, and it DOES NOT react to HCl |
Can you readily distinguish chalk from kaolin without acid? __________
Can you distinguish white feldspar from white calcite without acid?________
How? _______________________________________
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©David Leveson and David Seidemann - Brooklyn College - Earth and Environmental Sciences